@TungTran

Your question is not very clear.

When a change is made to the document the save button gets enabled by itself.

If you want to enable the save button programmatically without making change from screen, you can set your graph Primary view as Dirty and it will trigger enabling the Save. Like 

Base.Document.Cache.IsDirty = true;

If you are adding a brand new custom screen and want to have the standard buttons on the top, you will need to add your Primary DAC as the second parameter when you create the graph.

If you want to programmatically press the save button use Base.Save.Press();

Hi, @TungTran  Do you want to edit the shipment document details even after the shipment is confirmed for the Transfer type?

That's right. Because the IL department requires information change, after the shipment is confirmed for the transfer type

Hi @TungTran   If that is the case, this can be achieved through the Workflow automation steps.

You can refer to the below link for more details. 

https://asiablog.acumatica.com/2021/10/enable-customization-fields-when-document-is-completed.html